martin



(N0 Model.) I W I J. G. MARTIN. APPARATUS FOR GRINDING WHITE LEAD AND OTHER-MATERIALS.

No. 286,720; Patented Oct. 16, 1883.

INVENTOR @/%L Km 4%:

My PETERS. Fhe'wuzho m nm, Wnsunglon. 0 c.

1 UNITED STATES PATENT OFFICE. I

, To all whom, it may concern:

manner-such, for example, as shown in Fig.

' which it appertains to make and use the same,

specification.

described, but with half of the casing removed,

JOHN G. MARTIN, or :RICHMOND,

COUNTY OF SURREY, EXGLAND.

APPARATUS FOR GRlNDING WHITE LEAD AND OTHER MATERIALS.

SPECIFICATION forming part of Letters Patent No. 286,720, dated October 16, 1883.

Application filed December 1, 1882. (No model.) Patented in England March 18, 1879, No. 1.054 'in France September 18, 1879, No. 132,767; in Germany September 21, 1879, No. 10,209, and in Belgium September 26, 1879, No. 40,401.

Be it known that I, J OHN Cownnnr 1\IAR- TIN, a subject of the Queen of Great Britain, and residing at Richmond, in the county of Surrey and Kingdom of Great Britain, have invented certain new and useful Improvements in Apparatus for Grinding White Lead and other Materials, (for which I have obtained Letters Patent in Great Britain, dated March 18, 1879, No. 1,054; in France, dated September 18, 187 9,No.132,7 67 in Belgium,dated September 26, 1879, No. 49,401, and in Germany, dated September 21, 1879, No. 10,209,) and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to reference beinghad to the accompanying drawings, and to the letters or figures of reference marked thereon, which form a part of this This invention consists of the following improved arrangements in connection with apparatus for grinding white lead and other ma terials in a dry condition. NV hen the ordinary edge-runner stones are employed for this purpose, the dust produced being extremely poisonous and deleterious to health, I inclose these edge-runners within a casing and avoid the use of manual labor in presence of the poisonous lead-dust by making the apparatus nearly self-acting.

Figure 1 shows an edgerunner inclosed as in order to show the action of the apparatus more clearly. Fig. 2 is a similar view, butwith the edge-runner and apparatus connected therewith moved round a quarter-revolution. Fig. 3 is a sectional plan.

The material to be ground is fed in through the opening a in the side of the casing a, which opening may be provided with a cover, or may form part of a chute, or otherwise. I keep the materialwell under the stone or stones by fitting it on them with the ordinary scrapers, taking their motion from the vertical shaft, andarranged in any suitable or convenient 3 by the dotted lines I) c d, in which the scrapmixed, I throw it out by means of a suitably{ curved scraper, 0, attached to a rod, f, with a slot, formed in the upper part thereof, through which passes the lever h. This rod f passes through holes in the plates and s, which plates are fixed to and revolve with the central shaft, 7c. The lever h is secured at one end by a hinge or joint, i, to the plate j, and the other end is fitted with awheel or frictionroller, I, which runs on and is supported by a circular plate or tramway, m, fixed outside the stone or stones to the inside of the casing a, or in any other convenient position. A part, a, of this tramway is hinged at 0, and is caused to rise orfall by means of a chain, rod, or cord, p, passing over suitable guide pulleys, i,

' through the casing a, and attached to the eye it on the hinged part at of the tramway m. The tramway m is shown complete in all of the figures of the drawings, and the hinged part it is shown raised in Fig. 1, lowered in Fig. 2, and level with the rest of the tramway in Fig. 3. When the end of the hinged part n is lifted by means of the chain 1), as shown in Fig. 1, an opening or gap is formed in the circular tramway, and the wheel or friction-roller l. with its lever h, on reaching this opening falls through and passes under the tramway. The lever h in falling also carries with it the rod f and scraper e, which latter then rests on the bed q of the apparatus, throwing out, as it travels round with the stone or stones, the material through an opening, 1', provided for that purpose in the usual way. \Vhen this is effected the hinged part a of the plate or tramway an is lowered by means of the chain p and forms an inclined plane, as shown in Fig. 2, which the wheel or friction-roller l, with its lever h, ascends on -coming in contact with it, whereby the rod f andthe scraper e are lifted into their original position above the material on the bed q. The hinged part it being then raised by means of the chain 1), as shown in Fig. .1, a pin is inserted through the casing a in such a position as that when the hinged part 01 is lowered it shall be retained by the said pin at the same level as the rest of the tramway. The wheel or friction-roller Z then travels round and round on the tramway, and the scraper c is thus kept raised above the material on the bed 1 until the hinged part a is again raised, as in Fig. 1.

Inclosed edge-runners fitted with the scrapers and apparatus herein described may be used for mixing or grinding materials other than white lead, the dust or fumes of which it a is desired shall not escape into the atmosphere.

I claim- JOHN COWDERY MARTIN.

Vi tn esses:

WILLIAM HENRY BEoK, 139 Gannon Street, London.

STEPHEN EDWARD GUNYoN, 13 Farleigh Road, Stolce-Ncwingion, London. 

